- 1[not usually before noun] not drunk (= not affected by alcohol) I promised him that I'd stay sober tonight. He was as sober as a judge (= completely sober).
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- 2(of people and their behavior) serious and sensible a sober assessment of the situation He is honest, sober and hard-working. On sober reflection (= after some serious thought), I don't think I really need a car after all.
- 3(of colors or clothes) plain and not bright a sober gray suit
adverb He was soberly dressed.Idioms
having drunk no alcohol at allSee sober in the Oxford Advanced Learner's Dictionary
Check pronunciation: sober